Lost my installation Disk: How to restore my Snow Leopard to last month's system ?

Hi there,
I am on Snow Leopard 10.6.8 but have llost my Installation DVD that comes with it.
My system is now messed up and I want to restore it back to last month's status. I have Time Machine which I backup every month.
How do I restore without the Installation DVD which I have misplaced ?
Thanks

Lanny wrote:
But I do have the Lion Installation DVD from another iMac.
Lion never came on a DVD. Snow Leopard was the last OSX version shipped on DVD.
OSX DVDs the shipped with different Mac models, prior to Lion, are model number specific. You need to order a replacement set of DVDs that match your specific model.
Command-C boots to the CD/DVD drive, hence the letter, "C."
Command-R boots to the Recovery partition, hence the letter, "R."
Only Lion, Mountain Lion, and Mavericks have Recovery partitions.
Then this is good news. The disc that I have must be for Snow Leopard then.
I found 2 DVDs.
One says:
Mac OS X Install DVD
and the other:
Application Install DVD
Which one shall I insert into the CD drive ?
Thanks

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Lost my installation Disk: How to restore my Snow Leopard to last month's system ?

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